154661665331 has 4 divisors (see below), whose sum is σ = 162801753000. Its totient is φ = 146521577664.

The previous prime is 154661665307. The next prime is 154661665343. The reversal of 154661665331 is 133566166451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154661665331 is a prime.

It is a super-2 number, since 2×154661665331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154661665931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4070043806 + ... + 4070043843.

It is an arithmetic number, because the mean of its divisors is an integer number (40700438250).

Almost surely, 2^154661665331 is an apocalyptic number.

154661665331 is a deficient number, since it is larger than the sum of its proper divisors (8140087669).

154661665331 is an equidigital number, since it uses as much as digits as its factorization.

154661665331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8140087668.

The product of its digits is 1166400, while the sum is 47.

The spelling of 154661665331 in words is "one hundred fifty-four billion, six hundred sixty-one million, six hundred sixty-five thousand, three hundred thirty-one".